The term 'THIN INCISION' can be summarized as a 'SLIT', which is a four-letter word. A thin incision is a narrow cut made in the skin or other material, usually with a sharp object such as a knife or scalpel. It is often used in medical procedures, such as surgery, to make an opening for further treatment. Thin incisions are also used in other industries, such as manufacturing, to create precise cuts in materials.